To Fix any problems with broken firmware form attempted "playsforsure" firmware updates etc where your pc finds it as a 20mb drive and it sits in recovery mode and does bugger all:
(fix courtesty of cinderlee in creative forums)

1. Uninstall all creative software & drivers
2. Uninstall Media Player 11 and Media Player 11 runtime (will require a reboot for each thing). This is done by going to add/remove programs and uninstalling (this will put your pc back to wmp10).
3. Re-install the Zen Driver from the creative website and reboot
4, Plug Zen in.
5, Make sure you have the firmware update ready, run it but don't click the language bit yet), leave the mouse hovering over your language selection.
6. On the Zen- select "reload OS"
7. As soon as it flashes up "reload new firmware now via USB" click the language button
8. Tada, now the pc should find it and allow you to re-load the firmware. (it may take a few attempts)
9. Once complete, click close and restart the pc. Everything should now be fine.
10. once you are happy you can re-install WMP11 and it will work fine.